/*
 * This file is part of Applied Energistics 2. Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved. Applied
 * Energistics 2 is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General
 * Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
 * later version. Applied Energistics 2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
 * Public License for more details. You should have received a copy of the GNU Lesser General Public License along with
 * Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.services.export;

import java.io.File;
import java.util.List;
import java.util.concurrent.TimeUnit;

import javax.annotation.Nonnull;

import net.minecraft.item.Item;

import com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;

import appeng.core.AELog;
import cpw.mods.fml.common.Loader;
import cpw.mods.fml.common.ModContainer;
import cpw.mods.fml.common.registry.FMLControlledNamespacedRegistry;
import cpw.mods.fml.common.registry.GameData;

/**
 * Main entry point for exporting the CSV file
 * <p>
 * makes everything threadable
 *
 * @author thatsIch
 * @version rv3 - 14.08.2015
 * @since rv3 14.08.2015
 */
public class ExportProcess implements Runnable {

    private static final String FORCE_REFRESH_MESSAGE = "Force Refresh enabled. Will ignore cache and export CSV content.";
    private static final String CACHE_ENABLED_MESSAGE = "Cache is enabled. Checking for new mod configurations.";
    private static final String EQUAL_CONTENT_MESSAGE = "Same mod configuration was found. Not updating CSV content.";
    private static final String UNEQUAL_CONTENT_MESSAGE = "New mod configuration was found. Commencing exporting.";
    private static final String CACHE_DISABLED_MESSAGE = "Cache is disabled. Commencing exporting.";
    private static final String EXPORT_START_MESSAGE = "Item Exporting ( started )";
    private static final String EXPORT_END_MESSAGE = "Item Exporting ( ended after %s ms)";

    @Nonnull
    private final File exportDirectory;

    @Nonnull
    private final Checker<List<ModContainer>> modChecker;

    @Nonnull
    private final ExportConfig config;

    /**
     * @param exportDirectory directory where the final CSV file will be exported to
     * @param config          configuration to manipulate the export process
     */
    public ExportProcess(@Nonnull final File exportDirectory, @Nonnull final ExportConfig config) {
        this.exportDirectory = Preconditions.checkNotNull(exportDirectory);
        this.config = Preconditions.checkNotNull(config);

        this.modChecker = new ModListChecker(config);
    }

    /**
     * Will check and export if various config settings will lead to exporting the CSV file.
     */
    @Override
    public void run() {
        // no priority to this thread
        Thread.yield();

        // logic when to cancel the export process
        if (this.config.isForceRefreshEnabled()) {
            AELog.info(FORCE_REFRESH_MESSAGE);
        } else {
            if (this.config.isCacheEnabled()) {
                AELog.info(CACHE_ENABLED_MESSAGE);

                final Loader loader = Loader.instance();
                final List<ModContainer> mods = loader.getActiveModList();

                if (this.modChecker.isEqual(mods) == CheckType.EQUAL) {
                    AELog.info(EQUAL_CONTENT_MESSAGE);

                    return;
                } else {
                    AELog.info(UNEQUAL_CONTENT_MESSAGE);
                }
            } else {
                AELog.info(CACHE_DISABLED_MESSAGE);
            }
        }

        AELog.info(EXPORT_START_MESSAGE);
        final Stopwatch watch = Stopwatch.createStarted();

        final FMLControlledNamespacedRegistry<Item> itemRegistry = GameData.getItemRegistry();

        final ExportMode mode = this.config.isAdditionalInformationEnabled() ? ExportMode.VERBOSE : ExportMode.MINIMAL;
        final Exporter exporter = new MinecraftItemCSVExporter(this.exportDirectory, itemRegistry, mode);

        exporter.export();

        AELog.info(EXPORT_END_MESSAGE, watch.elapsed(TimeUnit.MILLISECONDS));
    }
}
